Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Summary of Inventories

	March 31, 2019		December 31, 2018
(Dollars in thousands)
Raw materials	$	50,274	$	49,571
Work in process		38,870		42,886
Finished goods		77,154		83,121
Inventories, net	$	166,298	$	175,578